Value is in enum list

Question

I have a fairly basic question: How can I check if a given value is contained in a list of enum values?

For example, I have this enum:

public enum UserStatus {     Unverified,     Active,     Removed,     Suspended,     Banned } 

Now I want to check if status in (Unverified, Active)

I know this works:

bool ok = status == UserStatus.Unverified || status == UserStatus.Active; 

But there has to be a more elegant way to write this.

The topic of this question is very similar, but that's dealing with flags enums, and this is not a flags enum.

Answer 1

Here is an extension method that helps a lot in a lot of circumstances.

public static class Ext {     public static bool In<T>(this T val, params T[] values) where T : struct     {         return values.Contains(val);     } } 

Usage:

Console.WriteLine(1.In(2, 1, 3)); Console.WriteLine(1.In(2, 3)); Console.WriteLine(UserStatus.Active.In(UserStatus.Removed, UserStatus.Banned)); 

Answer 2

If it is a longer list of enums, you can use:

var allowed = new List<UserStatus> { UserStatus.Unverified, UserStatus.Active }; bool ok = allowed.Contains(status); 

Otherwise there is no way around the long || predicate, checking for each allowed value.